Just the Essentials! Water Supply Equipment Construction Chief Engineer: Study Guide for the Water Supply Equipment Construction Chief Engineer Examination" with Red Sheet Tetsuro Ishihara This was purchased on Mercari. There are no markings, and I don't see any noticeable stains, but there may be some minor imperfections. I've taken photos of any areas of concern, so please refer to the images and purchase with your understanding. It will be shipped via Yu-Packet with waterproof packaging. I was able to pass the exam this year by reading this repeatedly during my studies, so I hope it will be useful for those taking the exam next year and beyond.